I told you they were going to release this, back when we saw that leaked Dell Streak ad. It's not available yet, but it is coming.
From the press release:
Amazon.com, Inc. (NASDAQ: AMZN) today announced that Kindle for Android, the free application that lets readers around the world enjoy Kindle books on their Android phones, is coming this summer. Kindle for Android enables customers to discover and read from over 540,000 books in the Kindle Store -- the largest selection of the most popular books that people want to read -- including New York Times Bestsellers and New Releases from $9.99. Like all Kindle apps, Kindle for Android will include Amazon's Whispersync technology, which saves and synchronizes a customer's bookmarks across their Kindle, Kindle DX, iPhone, iPod touch, iPad, PC, Mac, BlackBerry and, soon, Android, so customers always have their reading material with them and never lose their place. Kindle is the most wished for, most gifted and #1 bestselling product on Amazon.com.